Roasting-furnace.



e. P. DBWEIN. RoAsTING PURNAGE. 'APPLIOATION FILED JAN. 4, 1907.

i Patented Sept. 29, 1908.

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UNITED STATES PATENT OFFICE.

GEORGE F. DE WEIN, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS-CHALMERS COMPANY, Y OF MILWAUKEE, WISCONSIN, vA CORPORATION OF NEW .J ERSEY.

ROAST-ING-FURNACE Specification of Letters Patent.

Patented Sept. 29, 1908.

To all whom it 'may concern.'

Be it known that I, GEORGE F. DE WEIN, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Roasting-Furnace, of whichv cooling medium during its forcible discharge l from the stirring shaft caused by the formation of gas or vapor by the volatilization of the liquid cooling medium.

In the drawings,-Figure 1 is a vertical central section through the stirring shaft, the furnace being shown in outline. enlarged horizontal section on the line II-II of Fig. 1. Fig. 3 is an enlarged horizontal section on the line III-III of Fig. 1.

The invention has been illustrated in the drawings in connection with a McDougall type of furnace, that is, one with superposed hearths'. It is applicable to any form of furnace where a rotary stirring shaft is used, or in connection with any other form of cooled stirring arms. It is not necessarily limited to a stirring means for a roasting furnace, but may be applied to any cooled stirring means, the only essential being that the shaft is designed for using a liquid cooled medium. .The furnace 1 is illustrated as having circular side walls and hearths 2, 2, and a top arch 3. The rotary stirring shaft 4 is shown as centrally mounted and has a means 41 at the bottom for roviding a step bearing. Any means, not s own, may be used for rotating the shaft.v The shaft 4 has arms 42 extending horizontally and radially therefrom, and as shown in the drawing, they extend in two planes at right angles to each other. The shaft 4 and arms 42 are hollow and are in communication with each other. The shaft 4 is preferably constructed in sections, and, as shown in the drawing, each section has preferably attached thereto four arms.

The cooling means for therotating shaft consists of a stationary inlet pipe 5 extending down through the shaft 4 and terminating near the bottom of the shaft. A stufling box Fig. 2is an 43 at the upper end of the shaft 4 serves to prevent esca e of cooling medium around the pipe 5 and a so allows for rotation of the pipe 4 about the stationary pipe 5.

The outlet means for'the cooling medium consists of three separate outlet pipes 6, see Fig. 3, for the liquid medium, and three other separate outlet pipes 7, see Fig. 2, for the gas or vapor. These pipes 6 are short elbow pi es discharging downwardly into the annular trough 64, having an outlet 65 for the final discharge of the liquid coolin means. The annular trough 64 is supported uplon the furnace in any convenient manner. T e discharge pipes 6 lead from an enlargement 46 above a reduced ortion at the uper end of the shaft 4 and immediately beow a screen 47 in the enlargement 46 and surrounding the inlet pipe 5. The discharge pipes 7 lead from the enlargement 46 of the shaft 4 and extend upward y at an angle of about 45 de rees to the vertical for a short distance an then continue upwardly in a vertical direction. The discharge 1 es 6 lead first in a horizontal direction andp then downwardly in a vertical direction. The gas or vapor discharge pipes 7 alternate in plan view with the liquid discharge p1 es 6( The operation of the device is as fo lows: A liquid cooling medium, preferably water, is introduced into the stationary supply pipe 51 connecting with the top of the stationary inlet pipe 5. The cooling liquid after being discharged into the lower end of the stirring shaft 4 will circulate from that point through y the shaft and arms and its discharge will take place from the upper end of the shaft through the outlet means therefor. During this circulation any gas or vapor or steam into which portions of the cooling medium may have been transformed due to heat taken up from the furnace, will be carried along up with the liquid cooling medium to the outlet means. Upon reaching the enlargement 46 of the shaft 4, the liquid and gaseous mixture will strike the screen 47, the gas being carried through the screen while the liquid will practically all be stopped in its upward course. The liquid will then ass out through the discharge pipes 6, whi e the gas or vapor will be dischar ed through the outlet pi es 7. The liqui will be discharged into tie trough 64 and finally throu h the outlet 65, from whence it will be con ucted away in any desired manner. This invenemployed is a source of great annoyance due l sired to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled 1n the art.

tion therefore provides a discharge means for the cooling medium of a stirring shaft Which Will prevent the spouting of the liquid from the shaft in a violent manner because of the gas or steam formation which is liable to take place. Such possible violent dis- Letters Patent, is: charge from the cooling means heretofore 1. The combination of a hollow stirrer, inlet means thereto for a liquid cooling meto overflow from the trough 64 caused theredium, outlet means therefrom for liquid disby. In the present invention the steam and charge and separate outlet means for gas dis- Water is effectively separated prior to discharge communicating with the stirrer at a charge, the gas or steam passing through higher level than the communication thereseparate outlet pipes, While the Water passes With of the liquid outlet means. through separate discharge pipes. The 2. The combination of a hollow stirrer, greater height of the upper discharge pipes measured from the beginning of liquid discharge, provides a sufficient head to prevent the discharge of any liquid Which may splash through the screen 47. It should be noticed l that the discharge of the gas, vapor or steam l is such that its direction is not greatly dium, downwardly extending discharge means for the liquid and separate upper up- Wardly discharging means for gas.

3. The combination of a hollow stirrer, inlet means thereto for a liquid cooling medium, outlet means therefrom for liquid discharge, separate outlet means for gas discharge, and a screen inthe stirrerbetween the liquid and gas outlets.

In testimony whereof, I aflix my signature in the presence of two witnesses.

G. F. DE WEIN.

changed. It is almost in line With the shaft 4, there being but tWo angles of 135 degrees each inthe course of its discharge. Moreover, the separate discharge of the liquid from that of the gas Will insure a more comlete separation so that the chances are ljessened for discharge of liquid through the gas or steam outlets.

It should be understood that it is not de- Witnesses:

FEANK E. DENNE'rT H. C. CASE.

Vhat is claimed and desired to secure by inlet means thereto for a liquid cooling mei 

